A5049854296- Hydrogen embrittlement and corrosion behaviors in metals
- Fatigue and fracture mechanics
- Microstructure and Mechanical Properties of Steels
- High Temperature Alloys and Creep
- Asthma and respiratory diseases
- Congenital Heart Disease Studies
- Polymer composites and self-healing
- Cellular and Composite Structures
- Renal and Vascular Pathologies
- Cardiac Structural Anomalies and Repair
- Transportation Safety and Impact Analysis
- Cardiac Valve Diseases and Treatments
- High-Velocity Impact and Material Behavior
- Pulmonary Hypertension Research and Treatments
- Asphalt Pavement Performance Evaluation
- Elasticity and Material Modeling
- Metal Forming Simulation Techniques
- High voltage insulation and dielectric phenomena
- Hydraulic and Pneumatic Systems
- Education and Learning Interventions
- Health and Wellbeing Research
- Diverse Approaches in Healthcare and Education Studies
- Congenital Diaphragmatic Hernia Studies
- Risk and Safety Analysis
- Mechanical Failure Analysis and Simulation
Korea Institute of Machinery and Materials
2022-2024
Korea Testing & Research Institute
2022
Pusan National University
2015-2021
Myongji Hospital
2014-2020
Hanyang University
2020
Daegu Fatima Hospital
2019
Boston Children's Hospital
2012
Ajou University
2005
Keimyung University
1993-1998
316L stainless steel is a promising material candidate for hydrogen containment system. However, when in contact with hydrogen, the could be degraded by embrittlement (HE). Moreover, mechanism and effect of HE on have not been clearly studied. This study investigated exposure impact toughness to understand relation between charging time fracture at ambient cryogenic temperatures. In this study, specimens were exposed different durations. Charpy V-notch (CVN) tests conducted low temperatures...
A series of material tests were performed on cryogenic metallic materials meant for liquid hydrogen storage tanks using a 20 K tensile cryostat and an electrochemical hydrogen-charging apparatus. Mechanical evaluation the electrochemically hydrogen-charged specimens was in helium gas at ambient temperature (20 K). The equipped with vacuum jacket G-M cryocooler gaseous helium. Furthermore, cathodic electrolysis cell used charging adopted internal conditions reflux condenser heating mantle to...
Austenitic stainless steel is useful for storing and transporting liquefied natural gas (LNG) at temperatures below −163 °C due to its superior low-temperature applications. This study develops a computational method the failure prediction of 304L sheet utilize usability as design code industrial purposes. To consider material degradation in phenomenological way during numerical calculation, combined Swift–Voce equation was adopted describe nonlinear constitutive behavior beyond ultimate...
As the urgency for carbon-neutral fuels grows in response to global warming and environmental pollution, liquid hydrogen, with its high energy density, emerges as a promising candidate. Stored at temperatures below 20 K, hydrogen’s containment system requires materials resilient such cryogenic temperatures. Austenitic stainless steel, including 304L grade, has been widely used due favorable properties. However, designing pressure vessels these systems necessitates deep understanding of...
A colonic lipoma is a very rare benign tumor that usually asymptomatic and found incidentally by colonoscopy.Patients with large may present symptoms such as abdominal pain, bleeding, obstruction or intussusceptions.We report two patients lipomas symptoms.Standard endoscopic submucosal dissection (ESD) was performed to remove the instead of conventional surgical bowel resection.No complications were observed during after procedure.The tumors resected en bloc , discharged 2 d ESD regular...
The primary barrier in contact with LNG (Liquefied natural gas) cargo is manufactured from stainless steel, and has a corrugated membrane structure due to thermal deformation caused by extreme temperature differences. Because the tailored be watertight, structural integrity of must maintained despite increase sloshing load. Among various types fluid impacts hold, jet flow runs up along wall hold impact load exerted on side corrugation barrier. However, behavior under prevailing environment...
The present study investigates the strain-rate-dependent mechanical performances of three different kinds polymers in low-temperature applications, including plastic piping systems. Recently, lightweight constructions have been increasingly used ship and offshore structures because using low-density materials reduces structural weight products. However, most existing research outcomes not focused on applications. In study, failure characteristics acrylonitrile butadiene styrene (ABS),...
Purpose: Adherence is a major component of successful medical treatment.However, nonadherence remains barrier to effective delivery healthcare worldwide.Methods: Twenty facilities (secondary or tertiary hospitals) belonging the Korean Academy Pediatric Allergy and Respiratory Diseases (KAPARD) participated.Questionnaires were given patients currently receiving treatment in form inhalant useor oral intake transdermal patch for mild moderate asthma.Results: A total 1,838 responded...
Pumps, as core pieces of equipment in ships, are installed the engine room to supply refined oil engine. Pump failure causes critical problems for ship operations. Therefore, failure-monitoring-based diagnosis technology is an essential requirement shipbuilding industry. For this purpose, a database containing information about states depending on main cause cases pump needs be developed. In present study, pumps based actual accident records were quantitatively analyzed. Then, modes bearing,...
Abstract The mechanical properties of polyurethane foam (PUF) and glass fiber-reinforced PUF (R-PUF), which are widely used in various fields, were investigated considering the influence lateral confinement. R-PUF – representative polymeric foams with a porous structure suitable for severe environments (e.g. cryogenic field) because they have an excellent adiabatic function load-bearing capability. However, when actual structures, performance materials may change depending on conditions....
Previously, renal artery pseudoaneurysms were thought to be extremely uncommon. However, these lesions are now being detected more frequently as incidental findings on computed tomography, magnetic resonance imaging, and the extensive use of angiography. The incidence ruptured is very low. We report a case giant pseudoaneurysm (9.4-cm diameter) with severe left flank pain syncopal attack in young woman who did not control high blood pressure for couple years.
The curved plate has been extensively used as a structural member in many industrial fields, especially the shipbuilding industry. present study investigated ultimate strength and collapse behavior of simply supported under longitudinal compressive load. To do this, experimental apparatuses for evaluating buckling test plates was developed. Then, series experiments carried out by considering flank angle, slenderness ratio, aspect ratio plates. examine fundamental plate, elastoplastic large...
In this paper, concrete material tests were carried out to investigate influence of steel fiber volumn ratios on variations workability and strength characteristics reinforced high-strength concrete, <TEX>$50MPa{\sim}90MPa$</TEX> compressive strength, according increase volume. Test specimens arranged with six levels ratios, 0.0%, 0.5%, 1.0%, 1.5%, 2.0%. The test results showed that concrete(<TEX>$70MPa{\sim}90MPa$</TEX>, 1.5% ratio) good slump 20cm could be used practically effects...
Two types of accurate 3D finite element models were developed for lumbar spine L5 and L3-L5, a series computational analyses carried out to identify the mechanical behavior under compressive loads.In order establish precise FE model single segmental vertebrae, group computed tomography images was converted into geometric surface, tetrahedral mesh using image processing software.For analysis, two bones, namely, fully filled type with cortical bone, bone cancellous core, considered...
An automatic mooring system for a ship consists of vacuum suction pad and mechanical part, enabling quick safe ship. In the development system, design is key to secure enough forces achieve stable operation system. pad, properly designing its rubber seal determines performance pad. Therefore, it necessary appropriately maintaining high-vacuum condition inside as well achieving robustness long-time use. Finite element analysis requires use an appropriate strain energy function model...
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